Standards：
GB,_r81 62 Chinese national standard
ASTM A53 Standard of American Society of Testing Materials
ASME SA53 Boiler and pressure vessel--c-Ojrde of ASME 
Application：
Seamless steel tubes for manufacturing pipelines。vessels，equipment and mechanical structures
Model No.of major steel tubes：
1O,20,35,45,Q345,15CrMo,12Crl MoV,A53A,A53B,SA53A,SA53B, etc．
Diamensional tolerances:
|
Types of steel tubes
|
Outer diameter
|
Wall thickness
|
|
Cold-rolled tubes
|
Tube sizes(mm)
|
Tolerances(mm)
|
Tube sizes (mm)
|
Tolerances(mm)
|
|
＞30～50
|
±0.3
|
≤30
|
±10％
|
|
＞50～219
|
±0.8％
|
|
Hot-rolled tubes
|
＞219
|
±1.0％
|
＞20
|
±10％
|
Mechanical properties：
|
Standard codes
|
Models of steel tubes
|
Tensite strength（MPa）
|
Yield strength（MPa）
|
Elongation（％）
|
|
GB/T8162
|
10
|
≥335
|
≥205
|
≥24
|
|
20
|
≥390
|
≥245
|
≥20
|
|
35
|
≥510
|
≥305
|
≥17
|
|
45
|
≥590
|
≥335
|
≥14
|
|
Q345
|
≥490
|
≥325
|
≥21
|
|
15CrMo
|
≥440
|
≥295
|
≥22
|
|
12Cr1MoV
|
≥490
|
≥245
|
≥22
|
|
ASTM A53
ASME SA53
|
A
|
≥330
|
≥205
|
Check the table in ASTM A 53
Check the table in ASME SA53
|
|
B
|
≥415
|
≥240
|
Chemical composition:
|
Standard codes
|
Models of steel tubes
|
Chemical compositions（％）
|
|
C
|
Si
|
Mn
|
P
|
S
|
Cu
|
Ni
|
Mo
|
Cr
|
V
|
|
GB/T8162
|
10
|
0.07～0.14
|
0.17～0.37
|
0.35～0.65
|
≤0.035
|
≤0.035
|
≤0.25
|
≤0.25
|
/
|
≤0.15
|
/
|
|
20
|
0.17～0.24
|
0.17～0.37
|
0.35～0.65
|
≤0.035
|
≤0.035
|
≤0.25
|
≤0.25
|
/
|
≤0.25
|
/
|
|
35
|
0.32～0.40
|
0.17～0.37
|
0.50～0.80
|
≤0.035
|
≤0.035
|
≤0.25
|
≤0.25
|
/
|
≤0.25
|
/
|
|
45
|
0.42～0.50
|
0.17～0.37
|
0.50～0.80
|
≤0.035
|
≤0.035
|
≤0.25
|
≤0.25
|
/
|
≤0.25
|
/
|
|
Q345
|
0.12～0.20
|
0.20～0.55
|
1.20～1.60
|
≤0.035
|
≤0.035
|
≤0.25
|
≤0.25
|
/
|
≤0.25
|
/
|
|
15CrMo
|
0.12～0.18
|
0.17～0.37
|
0.40～0.70
|
≤0.035
|
≤0.035
|
≤0.25
|
≤0.30
|
0.40～0.55
|
0.80～1.10
|
/
|
|
12Cr1MoV
|
0.08～0.15
|
0.17～0.37
|
0.40～0.70
|
≤0.035
|
≤0.035
|
≤0.25
|
≤0.30
|
0.25～0.35
|
0.90～1.20
|
0.15～0.30
|
|
ASTMA53
ASMESA53
|
A
|
≤0.25
|
/
|
≤0.95
|
≤0.05
|
≤0.06
|
≤0.40
|
≤0.40
|
≤0.15
|
≤0.40
|
≤0.08
|
|
B
|
≤0.30
|
/
|
≤1.20
|
≤0.05
|
≤0.06
|
≤0.40
|
≤0.40
|
≤0.15
|
≤0.40
|
≤0.08
|
